crochet tension ring

It's a simple crochet ring. You print it flat, then throw it in boiling water or heat it with a hairdryer and twist it around a pen or anything with the right thickness for your finger. I designed it this way, so you can custome sice it to your findger and printing it falt makes it much stronger. I hope you like it and if you have any suggestions to impove it, just commend. Have fun printing :D